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Does the blood in veins or arteries have more oxygen? why?
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Does the blood in veins or arteries have more oxygen? why?

User Edward Dale
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Blood in the arteries contains more oxygen than that in veins because blood in arteries travels from the heart after being oxygenated by the lungs. Blood in veins is that returning to the heart and lungs after being depleted of oxygen.
User Pfx
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